Folding grindstone-frame.



I L. v. CALHOUN. FOLDING GRINDSTONE FRAME. APPLICATION FILED SEVPT. 7, 1916 Patented Dec. 26, 1916.

T TAT A ENTQFFIGE LAWRENCE v. CALHOUN, or GLEN'ELLYN, ILLINCIS, AssIeNoR TO snares, nonB oK &

COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or new YORK.

roma ne GRINDsToNE-FR E.

Application filed September 7, 1916. Serial No. 113,905.

To all whom it mayconcera:

Be it" known that I, LAWRENCE V. GAL- HOUN, a citizen of the United States, residing at Glenellym-in the county of Dupage and State of Illinois, have invented a new and useful Improvement in Folding Grindstone-Frames, of which the following is a specification. p v p My invention relates to certain new and useful improvements in folding grindstone frames, and more particularly to the construction of the hinge joint or bearing support of the. frame. I i

The inventionwill be more fully understood from the following detailed description, taken in connection with the accompanying drawings, in which I Figure 1 is a perspective view of a, folding grindstone frame embodying the invention; Fig. 2 is a side elevation, enlarged, of one-half of the hingevand the bearing, the other half of the hinge being shown in dotted lines; Fig- 3 is a side elevation of the opposite half of the hinge; Fig. 1 is a section on the line l of Fig. 2, and Fig. 5 is a section on the line 5 of Fig. 2.

Referring more particularly to the drawings, the numeral 10 designates the front pair of supporting legs, and the numeral 11, the rear pair of supporting legs of the grindstone frame. The legs 10, 11, on each side are secured at their upper ends to a hinge-joint construction, generally designated by the numeral 12. The two hingejoint members support bearings for the arbor of a grindstone 13, the projecting end of the arbor being provided with cranks, so that the stone may be driven as by a pair of treadles 14 and connecting rods 15. The operators seat designated 16, is supported by a pair of horizontal arms 17, the front ends of which are attached to the hingejoint members 12, and the rear ends of which are secured to struts 18, mounted upon the legs 11. A guard 19 is also carried by the horizontal arms 17 just in front of the seat 16.

The hinge-joint 12 to which the present invention is more particularly directed is illustrated in detail in Figs. 3 to 5, from which it may be seen that this member consists of a pair of hinged castings, designated. 20 and 21, respectively, each having a pivot bolt opening therein, the member 20 having a squared recess surrounding the pivot bolt Patented Dec. 26, 191sopening, and designated22, and the mem-" ber 21 having a mating lug adapted to loosely fit within the recess 22 and designated 24. In the assembled position of the parts as shown inFig. 5, the pivotbolt23 passes through the openings in the hinge member castings, the lug 24' and recess 22 servlng to hnnt the relative movement of i the two members.

To support the bearings for the grind stone arbor, the hingemembers 20, 21, are each provided with a quadrant-shaped seat, designated 25, and'having a shoulder or flange 26 at the outer end. In the assembled position of the parts as shown in Fi 2 the p 2:) two quadrant-shaped seats 25 oppose one another, being slightly spaced apart at the bottom and extending therefore ar'ound somewhat more than 180 of the bearing bushing 27 which theyreceive. Instead of being bored centrally, as is commonly the case, the bushing 27' is bored eccentrically, as indicated at 28, and so mounted in the supporting members 20, 21 that the center of the bore 28 lies directly below the center of curvature of the quadrant-shaped seats 25. 'The'upper orthicker iportion of the bushing 27 is centrally drilled and tapped to receive a grease cup 30 and the grease cup may be made use of to secure in place a light stamped metal cap piece 31.

In assembling the grindstone frame the hinge portions 12 are arranged with the flanges or shoulders 26 facing outwardly so that the bearing bushings 27 are held against axial movement in this direction, the stone itself serving to prevent their inward movement. The lug andrecessed lockjointby which the relative movement of the hinge members is limited is purposely constructed so loose that the weight of the grindstone will cause the seats 25 to pinch the bearing bushing 27 Since these seats extend over more than 180 that even should the grindstone and its bearings be removedthe frame would still main tain its approximate form.

While I have shown and described in considerable detail one specific embodiment of tion as broadly as is permissible in view of the prior art; What I claim as new and desire to secure by Letters Patent is:

1. In combination, a hinge member and bearing support for a folding grindstone frame, comprising a pair of pivoted leg members having seat portions adapted to embrace a cylindrical bearing bushing arranged on the opposing faces of their upper ends, and a bushing lying in the seat formed by the said portions, whereby downward pressure upon'the bushing will cause the latter to be grasped by the seat portions. 7

2. A hinge member and bearing support for a folding grindstone frame and com-' prising a pair of leg Inembers'hinged to-v gether intermediate their lengths, the said members having seat portions adapted to embrace a bearingbushingarrangedon the opposing faces of their upper ends and eX- tending around more than 180? ofthe periphery of the bushing, and a bushing lying in the said seat portions, whereby downward pressureupon the bushing will cause the latter tob'e' r a'sped arid locked in place the said seat portions.

, 3 A ,hin ge member and bearing support for a fold ng grindstone frame and comprising a pair of leg members, a pivot bolt securing said leg members in hinged relationship, .meansfor limiting the relative movement of said leg sections, bearing seat portions carried byv said legs above said pivot bolt, and a cylindrical bearing bushing mountedin said seat, the relative movement of said legmembers being suflicient to permit them to grasp the said bushing 4". In combination a bearingsupp'ort having a cylindrical bearingseat therein, and-a bearing bushing mounted for rotation inthe said seat, the said bushing having its internal .bore eccentric to its outer cylindrical surface. o V

. 5. A hinge member and bearing support for a folding grindstone frame and comprising, in combination, a pair of leg sections, a non-circular lug formed on one ofsaid sections, and a mating recess formed in the op: posite section, said lug and recess fitting loosely to permit a limited hinging move ment of the two sections, a pivot bolt securing the two sections together and holding the said lug in engagement with the said recess, quadrantshaped cylindrical seats arranged facing one another on the upper ends of said leg-sections, and an eccentrically bored bearing bushing mounted in the said seats. a

LAWRENCE V. CALHOUN.

Gopie s'o! this patent may'b" obtained fkir fi ir e'eents each, by a ddr e'ssing' the doinniissioner of Patents," Washington, D; G. 

